140809857 has 16 divisors (see below), whose sum is σ = 190176960. Its totient is φ = 92664000.

The previous prime is 140809849. The next prime is 140809871. The reversal of 140809857 is 758908041.

It is not a de Polignac number, because 140809857 - 2³ = 140809849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (140809807) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 163494 + ... + 164352.

It is an arithmetic number, because the mean of its divisors is an integer number (11886060).

Almost surely, 2^140809857 is an apocalyptic number.

It is an amenable number.

140809857 is a deficient number, since it is larger than the sum of its proper divisors (49367103).

140809857 is a wasteful number, since it uses less digits than its factorization.

140809857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1504.

The product of its (nonzero) digits is 80640, while the sum is 42.

The square root of 140809857 is about 11866.3329213367. The cubic root of 140809857 is about 520.2487185424.

The spelling of 140809857 in words is "one hundred forty million, eight hundred nine thousand, eight hundred fifty-seven".